/Engine/Plugins/Runtime/GeometryCache/Source/GeometryCache/Classes/GeometryCacheTrackTransformGroupAnimation.h
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virtual const bool UpdateMeshData ( const float Time, const bool bLooping, int32 & InOutMeshSampleIndex, [FGeometryCacheMeshData](API\Plugins\GeometryCache\FGeometryCacheMeshData) *& OutMeshData )